Scraping device



ot. 1z,19zs. 1,602,829

` J. A. MCCASKELL A SCRAPING DEVICE .Filed Jan. 19, 1925 3 sheds-sheet 1 lllllllllll n lll I Oct. l2 1926.

J. A. MCCASKELL.

SCRAPI'NG DEVI CE Filed Jan. 1.9,- 1925 5 Sheets-Sheet 2 Oct. 12 1926.

y 1,602,829 J. A. MccAsKELL scRAPING DEVICE Filed Jan. 19. 1925 5 sheets-sheet 15 l ./I TTORNE Y Patented Oct. 12 1926.

JASPER A. MOOASKEIiLfOF SALT'LAKE "CITY, `UTAH.

`'SCRALEING' DEVICE.

Applicationled Januar-y 19, 1925. SerialiNo. 3,543.

The present invention relates to a .scrap- .ing device especially .adapted .for use in removing the accumulated vfilter vcakes from filter presses, but the invention is of such charactcrthat it maywell be .adapted for use in connection with other apparatus. l-Ieretofore various scraping devices lhave been used in connection with filter presses Abut these .prior devices have been unsatisfactory, for various reasons.

A leading object of the present .invention is the provision ofa deviceof-tliis character ywhich will efficiently and completely vremove thefiltercake from the filter leaf,but which, at the .same time, does'not yhave its scraping `plate indirect contact with the filter' leaf.

A further object of the invention is ,the Lprovision of a scraping device which has a rolling contact with the filterleaf, the `rolling means on the scraper being driven from the movementof the `filter leaf.

.A further object of the invention lis .the provision of a scraping devicefso constructed `that the filter cake cannot adhere tothe rolling contact means, Vcannot clog orV jam upon anypart of the scraper so as .to interfere with .the operation of the latter.

A still 4further object of the invention is the provision .of a scraping device which, 30 with immaterial modifications, may .be adapted 'for :use in connection with filter .presses of either the disk or drum type, and which will operate equally effectively with eithertype of filter press.

A still further object of the'invention is the provision Aof mounting means for the scraping device which `permit va resiliently yielding contact between the roller means of the scraper and the filter-leaf, such mount-- ing permitting the scraper' to adapt itself to irregularities, and Vchanges in the contour of the filter leaf and the accumulated 'filter cake.

W'ith the above and other objects in view,

my invention consists in parts,.arrangements and combinations of parts, which I `will hereinafter descriheand claim. In the drawings, forming Ypart of this specification, and in which Vlike reference numerals indicate like parts in the several views: y

Figure 1 is a plan view of thepresent device, applied to a filter press ofthe disk type Fig. `2 lisan end view of .the same.

.Finn irai fig. 5 is a .plan view of the scraping ldevice, applied to a filter press of the drum type. Y v

F 1g. 6 is an end view ofthe same.

Referring to the drawings, the numeral l ,indicates the stationary framework of the filter press. The numeral 1L indicates another part of the said stationary framework. Within the framework .1 .the filter disks 2 .are mounted, `the disks having a rotary .movement as is `well known. At the -periphery of the filter disk 2 a ring 3 is carried, the `said ring carrying a .toothedisegment 4 thereon. Mounted upon the inner 3 is 4.a section on :the line `3--3 of 4 is a Asection on the line 4-4 of .fface of the framework l is a pivot 5, which may be screwed into or otherwise vattached `to the framework. `Mounted uponthispivot is an arm 6, a bolt or other device 7 retain- Aing .the said arm in position upon the pivot. Spaced from the said pivot and screwedor `otherwise attached to a flanged portion lc of .the framework ris ,a bearing 8, which has pivotally mounted Vthereon a block 9, which latter carries a pin 10. The end of the arm 6 Ladjacent the saidl pin 10, has an opening Gaitherein .through which the pin 10 passes. A coiled spring 11 surrounds the pin 10, `one end of .the spring bearing against lthe block 9, and the opposite end against the arm 6. At its oppositeend the arm 6 car- .ries a bearing block 12 within which is mounted the end of a shaft 13. Fixed to the-shaft 13 is a gear wheel 14 which meshes with the gear segment 4 upon the ring 3 of `the filter leaf, whereby the movement of .the :filter leaf is .transmitted `in turn to Athe shaft 13. Also affixed 4to the shaft r13 are a series kof rollers 1,5, the said rollers de- .creasing in .size during the length ofv the shaft. Between the rollers 15 bushings 15X are mounted, surrounding the shaft 13, the bushings thus spacing the rollers the required distance. At .its opposite end the `shaft "13 is mounted within a bearing block 16 which is in turn pivotally mounted, by means of the pivot 17 upon a member 18, which is in turn bolted or otherwise attached to ,the portion 1a of the 4stationary framework. A lock nut 19is` mounted upon the shaft 13 to retain the rollers thereon in` position.

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The arm 6 carries a lug portion 20, to 'which is bolted, or otherwise attached, a scraper plate 21, which will hereinafter be designated as the upper scraper. This scraper plate 2l has a series of slots 21a therein, of diminishing depth from left to right in Fig. l, the said slots being adapted io receive the rollers l5, the front edge of 1the plate thus extending between the rollers and terminating,` adjacent the bushings l5", upon the shaft 13. fit its opposite end, the upper scraper 2l is attached to a lug 22 carried by the bearing` 16. A second, or lower scraper plate 23 is attached to a corresponding lug 24fupon the arm 6, and this lower scraper plate is likewise slotted at 23a to receive the rollers 15. rfhe forward end of the lower scraper' plate terminates adjacent but not in direct contact with the surface of the filter leaf 2. The opposite end of the lower scraper plate 23 is attached to a lug 25 likewise carried by the bearing 16.

lfn the operation of the present device, the filter press being in operation, and a filter cake accumulated upon the filter leaf 2, the revolution of the filter leaf and the ring` 3 at the periphery of the same will, through the gear segment t and the gear wheel lef cause a rotation at corresponding speed of the shaft 13 and the rollers l5. rfhc filter -ake upon the leaf 2 will thereupon pass by the forward edge of the lower scraper 23 which will thereupon cut away the accumulated cake from the filter leaf, the accretions of filter' cake being); forced rearwardly upon the said scraper plate and beingdischarged in suitable manner at the rear of the plate. rfhe upper scraper 2l will remove all cake that might have a. tendency to adhere to the bushings l5, and all cake which might likewise have a tendency to clog` and accumulate in the space between the rollers l5, it being noted that all such cake removed by the upper scr per 2l will remain below the piane of the scraper, and in turn pass rearwardly in the space between the lower scraper and the under surface of the upper scraper. The slots in the serapers 2l and 23 will reasonably snugly fit the rollers l5 and prevent any adherence of the filter cake to the periphery7 or sides of the rollers, such filter cakJ beingv removed and passing with the remainder of the cake rearwa 1dly in the space between the two scrapers. Since the scraper assembly is pivotally mounted at both ends, it can adapt itself to any changes in the surface of the filter leaf. For instance, when the filter cake is to be discharged from the leaf, it is customary to inject compressed air into the filter press for the p 1-rpose of blowing the leaf outwardly, thus assisting` in the renioval of the accumulated cake. Upon such outward blowing' of the filter leaf the present scraper would be permitted to move with the leaf, so that at all times the lower scraper would be maintained at a predetermined distance from the surface of the filter leaf. The resilient mounting at the end of the arm 6, opposite to that end carrying the rollers and scraper assembly, assists in the conformation of the scraper assembly to the contour of the filter leaf, any outward movement of the forward end of the arm causing a compression of the spring at the rearward end, and upon release of the pressure at the forward end the spring' would cause the forward end to resume its former position, still in contact with the filter leaf.

fn 5 and 6 lf have shown the present device attached to a filter press of the drum type. ln this modification the construction of the scraper is substantially the same, with the exception that it is not necessary to form the rollers of diminishing diameter as in the case of the disk filter press heretofore described. In this modified form the arms and 3l are pivotally mounted upon stationary framework 32 adjacent the filter. ln this instance the arms 30 and 3l are substantially similar, are mounted upon pivots 32 and respectively, and their rearward ends backed by resilient means 3i, 35 respectively, and carry at their forward ends bearings 3G, 37 in which are journaled the ends of a shaft 38. Upon the shaft 38 are a series of rollers 39, of equal diameter, and bushings 40 surround the sha-ft 38 and space the rollers. A lower scraper plate el, and an upper scraper plate 412 are mounted upon the arms 30 and 3l, in similar manner as described with reference to the device shown in Figs. l to linclusive. The scraper plates 4:1 and l2 have slots ll and 42 respectively therein, to receive the rollers 39. ln this type of filter the rollers may receive movement by reason of 'their Contact with the surface of the filter leaf, or the shaft 3S may carry a gear Il?) which meshes with a gear segment upon the periphery of the filter drum 45. This modified form of the device, for use in connection with filter presses of the drum type, operates in the same manner as the device used in connection with the presses of the disk type, hereinabove described. rf`he Scrapers al and 4t2 remove the accumulated cake in the manner described above, and the entire device functions in the identical manner as the device of the disk filter.

lfhe present device in use upon either type of filter press will function efficiently to remove the cake, will, by reason of the fact that the scraper plate is kept from direct contact with the cloth of the filter leaf, prevent wear upon and damage. to the filter cloth, and yet at the same time will remove the entire acciunulated cake as efficiently as the former cevices in which the scraper directly rested against the filter leaf, or in other cases where the cake was picked up by a roller and the cake then removed from the roller by a scraper. In the present device all of the cake is kept below the upper scraper, and passes to the rear, to a suitable discharge, in the space between the two Scrapers. VVhile the present device has been described in connection with filter presses, it is of course und stood that it may be used in connection wifh other apparatus where accumulated substances are to be removed from a given portion of the apparatus, and the invention is not to be understood to be limited to use in connection Vwith filter presses. v

Having thus described the invention, what I claim as new and desire to secure by Letters Patent, is

l. A device for use in removing the accumulated filter cake from the movable surfaces of filter presses, comprising a scraper element, means ,for mounting the scraper element for movement toward and away from the movable surface of the filter press, yieldable means cooperable with the mounting means for urging the scraper element toward the movable surface of the filter press, aroller pivotally and positively connected to the means for mounting the scraper and riding on the movable surface to cause the scraper element to ymove toward and away from the movable surface in accordance with the irregularities of the movable surface, and means for positively driving the roller from the filter press.

2, A device for use in removing the accumulated filter cake from the movable surfaces of filter presses, comprising a scraper element. a swingable mounting for said scraper element, yieldable means cooperable with the mounting for urging the scraper element toward the movable surface of the filter press, a plurality of rollers rotatable on said mounting and riding on the movable surface, and means for cleaning accumulations from said rollers.

A device for use in removing the accumulated filter cake from the movable surfaces of filter presses, comprising a scraper element, a swingable mounting for said scraper element, yieldable means cooperable with the mounting for urging the scraper element toward the movable surface of the filter press, a plurality of rollers rotatable on said mounting and riding on the movable surface, means for cleaning accumulations from said rollers, and comprising a second scraper element located above the first and slotted to accommodate the rollers. f t

ll. A device for use in removing the accumulated filter cake from the movable surfaces of filter presses, comprising a scraper element, a swingable mounting for said scraper element, yieldable means cooperable with the mounting yfor urging the scraper element toward the movable surface of the filter press, a plurality of rollers rotatable on said mounting and riding on tho movable surface, means for cleaning accumulations from said rollers, and means for positively driving the rollers.

5. A device `for removing accumulated substances from a movable surface mounted `within a fixed framework, comprising two spaced arms mounted upon said framework; a scraper carried by said arms; a shaft likewise carried by said arms; a plurality of rollers upon said shaft, said scraper being slotted to receive a portion of said rollers; means for rotating said rollers from the movable surface; and means lfor holding the rollers in contact with the movable surface and in turn holding the scraper adjacentA but out of direct contact with the said surface.

6` A device for removing accumulated substances from a movable surface, comprising a stationary frame work; two arms mounted upon said frame work; a lower scraper carried by said arms, said scraper having a series of slots therein; a second scraper above said lower scraper, said second scraper likewise having a series of slots therein; a shaft- .carried by said arms; a plurality of rollers mounted uponsaid shaft,

lsaid rollers being disposed within the slots in said Scrapers; means whereby the movement of the movable surface is transmitted to said rollers; and means for holding the rollers in contact with the movable su 1face and positioning the said lower scraper ad- ;acent but out of contact with the said surface.

7. A device for removing accumulated Y substances from a movable surface, coniprising a fixed framework adjacent said movable surface; two arms pivotally mounted. upon said fixed framework; a shaft journaled in said arms and extending between the same; a plurality `of spaced rollers upon said shaft; a lower scraper carried by. said arms, said scraper having a' series of slots therein receiving a portion of said rollers; the forward end of said scraper being adjacent the movable surface; a second scraper above said lower scraper; said second scraper being carried by said arms, saidv second scraper having a series of slots therein to receive a portion of said rollers, said second scraper having its forward end extending between said the said shaft; means for imparting the movement of the movable surface to the said rollers; and means for holding the said 1 rollers in contact with the said movable surface.

In testimony whereof I hereunto aflin my,

signature.

JASPER. A.. M CoAsKELL.

rollers and adjacent 

